ERA20CA228

NTSB accident investigation · Thorp Thorp T 18 · Madisonville, TN · May 29, 2020

Accident · Minor injuriesClass 4 · Data collectionFinal report
Date
May 29, 2020, 14:30 local (18:30 UTC)
Place
Madisonville, TN
Injuries
1 minor
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N70BZThorp Thorp T 18
Defining event
Landing: Loss of control on ground
Weather
Visual (VMC) · Day
Status
Completed
Report
Approved by Office Director
Investigation class
Class 4 - Basic report with no Prelim publish
NTSB office
Eastern Region Aviation
Parties
FAA/FSDO
FAA report
20200529010469A
Case key
101484

From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.

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Probable cause

The pilot's failure to maintain directional control during the landing roll on a soft turf runway, which resulted in a nose-over.

Findings · 3

NTSB’s coded findings. Those marked are part of the probable cause; the rest are factors or other findings. Under each, the cases with the same finding.

Runway/land/takeoff/taxi surface: soft surfaceEnvironmental issues › Physical environment · Contributed to outcomeGardner William R THORP T-18: 1 caseAll aircraft: 264 casesProbable cause
Performance/control parameters: directional controlAircraft › Aircraft oper/perf/capability · Not attained/maintainedGardner William R THORP T-18: 1 caseAll aircraft: 3,958 casesProbable cause

Sequence of events

The events NTSB coded, in order, by phase of flight. The defining event is the one that best describes the accident. Under each, the cases with the same event anywhere in their sequence.

Analysis

The pilot of the tailwheel-equipped airplane reported that he was landing on a soft turf runway following an uneventful local flight. During the landing roll, he applied "a little too much braking," and the airplane nosed over. Postaccident examination of the airplane by a Federal Aviation Administration inspector revealed that the vertical stabilizer, rudder, and fuselage were buckled. The pilot reported that there were no mechanical malfunctions or failures with the airplane that would have precluded normal operation.

Aircraft

Registration
N70BZ
Reported as
Thorp Thorp T 18 (Undesignat)
Category
Airplane, amateur-built
Serial number
1325
Built
2005
Airframe hours
550
Engine
Lycoming O-320-H2AD, 160 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Airworthiness certificate
Special, Experimental (Special)
Last inspection
Condition · May 25, 2019
Departed
Madisonville, TN
Destination
Pvt, TN
Equipment
Stall warning system, Handheld GPS, Electronic flight bag or handheld device, ADS-B

Matched to the registry by N-number and the event date; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
33
Injuries
Minor
Certificates
Commercial, Flight instructor
Airplane ratings
Single-engine land, Multi-engine land
Instrument ratings
Airplane, Helicopter
Medical
Class 1, Without waivers/limitations
Seat
Left
Restraint
4-point
Flight hours
1,372 total · 77 in this make and model · 393 as pilot in command · 23 in the last 90 days · 9 in the last 30 days · 5 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Visibility
10 statute miles
Lowest ceiling
None
Temperature
84 °F, dew point 64 °F
Altimeter
30.00 inHg
Observed at
MMI, 12 nm away

Docket · 5

The files NTSB released with the investigation on October 9, 2020, on NTSB’s docket system: statements, records, photos and specialists’ reports. 6.3 MB in all.

FAA reports on this event · 1

The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.